I insert a 200W load Immediately te UPS go in Bypass mode Then try disconnect the bypass to go On-Line but the display shows BUS UNBALANCE! I also replaced the ( 4 ) capacitors 330Mf - 450V Can You Help me? [email protected]
SOURCE: Powerware 9120 UPS
yes..and that happens after a period of time. When you get new ones, check the instructions on the initial charge/discharge requirements, and use those methods. tends to help with the battery life extension.
SOURCE: i have a powerware 9120
Did your UPS display "Battery disconnected" or did it display "Battery Failure"? If it was "Battery Failure", for some reason the Powerware 9120 will take almost 18 hours after plugging in to power after battery replacement to correct the Battery Failure indication. Charger has to charge up the batteries, followed by an automatic battery test by the UPS. If the indication was "Battery Disconnected", you will need to check the internal fuses to see if they are blown. If the UPS keeps blowing fuses, it will require a board repair.
SOURCE: I HAVE A POWERWARE 9120 MODEL NO PW9120-3000I UPS
Check your DC bus fuse. I have a manual if you need one. Email me at [email protected]
The charger board has fail. No point replacing it. Better to buy a new. This unit has already been obselete
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